Re: Reading from 38000 in assembler

Andreas Steibl wrote:
> Hi, i just tried to write some code in assembler.
> Compiling and executing the code from the JAVA file workes fine, but i
> didn't get the correct result.
>
>
> this is the working code in java
>
>
> keyPort = new com.dalsemi.system.DataPort(0x380000);
> keyPort.setFIFOMode( true );
> keyPort.setStretchCycles(DataPort.STRETCH10);
> keyPort.read()
>
>
> and the not working code in assembler code : (allways getting 249)
>
> readKey:
>         WOS_DISABLE_INTERRUPTS
>         TIMEDACCESS
>         ANL MCON,#11110000B
>
>         orl CKCON, #00000111b
>
>         mov dptr, #380000h
>
>         movx a, @dptr
>
>         TIMEDACCESS
>         orl mcon,#00001111B
>         WOS_ENABLE_INTERRUPTS
>
>         mov R0, a
>         clr a
>         mov R1, a
>         mov R2, a
>         mov R3, a
>
>         ret


Why are you changing the MCON register?

Your DataPort code indicates you are working in CE space (address 0x380000) and 
not PCE space (address 0xb80000=0x380000+0x800000... See DataPort JavaDoc). I do 
not believe you need to touch MCON to access this address.

You should also save and restore the CKCON register if you change it's value.



--
Tom Chenot
Dallas Semiconductor
http://www.dalsemi.com
--

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